CVE-2026-53515
7.1 · HIGHOverview
CVE-2026-53515 is a high-severity vulnerability affecting better-auth better-auth\/sso. It was published on July 15, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.
Remediation
Check the references section for vendor advisories and patches from better-auth. Update better-auth\/sso to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| better-auth | better-auth\/sso | >= 0, < 1.6.11 | Affected |
| better-auth | better_auth | >= 1.2.10, < 1.6.11 | Affected |
Frequently Asked Questions
What is CVE-2026-53515?
CVE-2026-53515 is a high-severity vulnerability affecting better-auth better-auth\/sso. It was published on July 15, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).
How severe is CVE-2026-53515?
This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-53515?
Check the references section for vendor advisories and patches from better-auth. Update better-auth\/sso to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-53515?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-53515 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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